<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>getElementsByTagName获取checkbox进行全选</title>
		<style type="text/css">
			#myTable{ width: 900px; margin: 0px auto; background-color: #008000;}
			#myTable td,#myTable th{ background-color: white;}
			#myDiv{width: 900px; margin: 0px auto; height: 30px; line-height: 30px; 
			text-align: center;}
		</style>
		
	</head>
	<body>
		<script>
			function SelAll() {
				var selAll=document.getElementById('selAll')
				var checkbox=document.getElementsByName('checkbox')
				for (let i = 0; i < checkbox.length; i++) {
					if (selAll.checked==true) {
						checkbox[i].checked=true
					}else{
						checkbox[i].checked=false
					}
					
				}
			}
			function SelOpposite() {
				var selOpposite=document.getElementById('selOpposite')
				var checkbox=document.getElementsByName('checkbox')
				if (selOpposite.checked==true) {
					for (let i = 0; i < checkbox.length; i++) {
					if (checkbox[i].checked==true) {
						checkbox[i].checked=false
					}else{
						checkbox[i].checked=true
					}
				}
				}
				
			}
		</script>
		<table cellspacing="1" id="myTable">
			<tr>
				<th width="200">
                  <input type="checkbox" id="selAll" onchange="SelAll()" />全选
				<input type="checkbox" id="selOpposite" onchange="SelOpposite()" />反选
                        </th>
				<th width="200">姓名</th>
				<th width="200">性别</th>
				<th width="200">专业</th>
				<th width="200">爱好</th>
			</tr>
			<tr>
				<td><input type="checkbox" name='checkbox'/></td>
				<td>刘备</td>
				<td>男</td>
				<td>软件开发</td>
				<td>抽烟</td>
			</tr>
			<tr>
				<td><input type="checkbox" name='checkbox'/></td>
				<td>关羽</td>
				<td>男</td>
				<td>国际贸易</td>
				<td>喝酒</td>
			</tr>
			<tr>
				<td><input type="checkbox" name='checkbox'/></td>
				<td>张飞</td>
				<td>男</td>
				<td>园林设计</td>
				<td>烫头发</td>
			</tr>
			<tr>
				<td><input type="checkbox" name='checkbox'/></td>
				<td>赵云</td>
				<td>男</td>
				<td>平面设计</td>
				<td>抽烟</td>
			</tr>
			<tr>
				<td><input type="checkbox" name='checkbox'/></td>
				<td>黄忠</td>
				<td>男</td>
				<td>影视制作</td>
				<td>玩游戏</td>
			</tr>
			<tr>
				<td><input type="checkbox" name='checkbox'/></td>
				<td>小乔</td>
				<td>女</td>
				<td>高级护理</td>
				<td>唱歌</td>
			</tr>
		</table>
	</body>
</html>